NEW YORK (CBSDFW.COM/AP) – T-Mobile, the country’s fourth-largest cellphone carrier, is set to complete its acquisition of Dallas-based MetroPCS after the stock market closes on Tuesday.

With some 34 million subscribers, T-Mobile USA is the country’s fourth-largest cellphone company. While the acquisition will add nine million MetroPCS customers, the combined company will still lag No. 3 Sprint Nextel Corp. in size.

No immediate changes are expected for MetroPCS customers, but T-Mobile USA plans to shut down MetroPCS’s network over two years, which means MetroPCS phones will eventually stop working. T-Mobile will use the space freed up on the airwaves to boost its own coverage and data speeds.

T-Mobile USA, a subsidiary of Germany’s Deutsche Telekom AG, will gain its own U.S. stock listing by merging with MetroPCS Communications Inc., which is listed on the New York Stock Exchange.